Toronto - Air Quality Health Index

Observed ConditionsFootnote †

Calculated at: 3:00 AM EST Monday 3 March 2025

3Low Risk




1
2
3
4
5
6
7
8
9
10
+

Low Risk
(1-3)

Moderate Risk
(4-6)

High Risk
(7-10)

Very High Risk



At-Risk Population:

General Population:

  • Ideal air quality for outdoor activities.

Forecast Maximums

Issued at: 5:00 PM EST Sunday 2 March 2025

Sunday night

4 - Moderate Risk

Monday

4 - Moderate Risk

Monday night

3 - Low Risk

Tuesday

3 - Low Risk

Who is at risk?

People with heart and lung conditions are most affected by air pollution.

To find out if you are at risk, consult the health guide, your physician, or your local health authority.

Visit the national AQHI Web site to learn more about the AQHI.

Did you know...?

Air pollution triggers respiratory diseases like asthma in tens of thousands of Canadians.


The AQHI is an initiative between Environment Canada, Health Canada and the Province of Ontario.

AQHIScale

Observed ConditionsFootnote †


3 - Low Risk

Calculated at:

3:00 AM EST Monday 3 March 2025

 

Forecast Maximums


Sunday night
4 - Moderate Risk



Monday
4 - Moderate Risk



Monday night
3 - Low Risk



Tuesday
3 - Low Risk




Issued at:

5:00 PM EST Sunday 2 March 2025

 

The AQHI is an initiative between Environment Canada, Health Canada and the Province of Ontario.

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